Malicious PDF — malware analysis report

Static analysis result for SHA-256 335d36565b7ac440…

MALICIOUS

PDF

117.0 KB Created: 2021-07-07 21:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f8be88380c607e2e1936caea468a31f SHA-1: d593b2d2b6a4e6017100d2555cd840b4ff8cbcce SHA-256: 335d36565b7ac440da002d6ec3ebcb30c3d4f2960cf12d5e350436c64637095f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://greenlivinggarden.com/htdocs/UserFiles/file/rifimujeferodezakod.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//83621833578.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f051149d0---pirimex.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/turuze.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/kagilozorabesujevekowe.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/rapenujabejuropes.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160758273b5792---69490688047.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ecb7f7cef76e87e9496a99477575a552/32949481335.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/47f203ec78e37af5d9909f245e06a198/zevokefusenatapelokogu.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/803dbb8d8c25c5fc73971898086cabe4/satawoj.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/5851358053.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/925075141d77dc1893556f640f38cf62/jazimusejo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a8628745092---bijulopadurokisoti.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/693fc83e7c38985dde5958ce0aca687c/dasozunefakagonoranuloj.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/39669839801.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/52aec23d307b5cd3084c873153e90839/98299653771.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/gr28haudog0pak7e9f1ssb1d08/18706993446.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/50468967844.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/29501945306.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/vobalifeketekexov.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de6643b0285---50903960758.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc11ea2fd6a154ce460b3fbbc4e15b32/lojerafur.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe0229e63d---36369446340.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/d6f1f22b1f86ba87036adc64edc8aefb/mokuwi.pdfIn PDF document text
    • http://promador.pl/userfiles/file/30631106041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=inclined+water+manometerPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001665b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665B 19016 bytes
SHA-256: 778f66a27ab9e304a63cf417b42d91082016f0a2110a22ca80779d20ccbd0e0c
font_02_sfnt_off00019921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19921 16120 bytes
SHA-256: b29a4963f152f3285ac57db2468d4c0d0bba524d53a493f36b30dc4cb38a8457
font_03_sfnt_off0001ae89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE89 10400 bytes
SHA-256: 0aa981093f7dace03969021a3ac3c2159e5724efff82bf30da839c1743644e35

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